Strong mag. 5.4 earthquake - Japan Sea, 123 km west of Hirosaki, Aomori, Japan, on Monday, 20 June 1983 at 02:43 (GMT)

Strong mag. 5.4 earthquake - Japan Sea, 123 km west of Hirosaki, Aomori, Japan, on Monday, 20 June 1983 at 02:43 (GMT)

Strong magnitude 5.4 earthquake at 18 km depth

1 Jan 00:00 UTC: First to report: USGS after 30 seconds.
Date & time: 20 Jun 1983 02:43:24 UTC
Magnitude: 5.4
Depth: 18.3 km
Epicenter latitude / longitude: 41.004°N / 139.12°E (Japan Sea, Japan)
Nearest volcano: Oshima-Oshima (60 km / 37 mi)
Nearby towns and cities:
108 km (67 mi) W of Shimokizukuri (Tsugaru) (pop: 18,900) --> See nearby quakes!
113 km (70 mi) W of Goshogawara (pop: 49,100) --> See nearby quakes!
117 km (73 mi) NW of Noshiro (pop: 51,100) --> See nearby quakes!
123 km (76 mi) WNW of Hirosaki (pop: 175,000) --> See nearby quakes!
129 km (80 mi) WNW of Kuroishi (pop: 38,600) --> See nearby quakes!
137 km (85 mi) W of Aomori (pop: 298,400) --> See nearby quakes!
146 km (91 mi) NW of Ōdate (pop: 64,500) --> See nearby quakes!
166 km (103 mi) NNW of Akita (pop: 320,100) --> See nearby quakes!
294 km (183 mi) SW of Sapporo (pop: 1,883,000) --> See nearby quakes!
593 km (369 mi) N of Tokyo (pop: 8,336,600) --> See nearby quakes!
Primary data source: USGS (United States Geological Survey)
Estimated released energy: 7.9 x 1012 joules (2.21 gigawatt hours, equivalent to 1898 tons of TNT or 0.1 atomic bombs!) More info
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Data for the same earthquake reported by different agencies

Info: The more agencies report about the same quake and post similar data, the more confidence you can have in the data. It takes normally up to a few hours until earthquake parameters are calculated with near-optimum precision.
Mag.DepthLocationSource
5.418 kmHokkaido, Japan regionUSGS
Note: for quakes of 2012 and earlier, our database often contains only records from USGS.

User reports for this quake

User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
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Aftershocks

More info
Recorded aftershocks, latest first (2 quakes):
  • 30 Jun 1983 04:33 UTC
    | M 4.6 |
    33 km (20.5 mi) depth
    |
    11 km (7 mi) distance
    | USGS | Details
  • 22 Jun 1983 04:36 UTC
    | M 5.0 |
    14.5 km (9 mi) depth
    |
    12 km (7 mi) distance
    | USGS | Details

Earlier earthquakes in the same area

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